I'm attempting to move files to another server to setup a slave. I have a database on one Postgres Server and am attempting to create a file-based backup using pg_backup. However, it never finishes executing the command.

Here is the output:

/usr/pgsql-9.2/bin/pg_basebackup -U postgres -D - -P -Ft > pg_backup.backup
11247472/11247472 kB (100%), 1/1 tablespace
NOTICE: pg_stop_backup cleanup done, waiting for required WAL segments to be archived
WARNING: pg_stop_backup still waiting for all required WAL segments to be archived (60 seconds elapsed)
HINT: Check that your archive_command is executing properly. pg_stop_backup can be canceled safely, but the database backup will not be usable without all the WAL segments.
WARNING: pg_stop_backup still waiting for all required WAL segments to be archived (120 seconds elapsed)
HINT: Check that your archive_command is executing properly. pg_stop_backup can be canceled safely, but the database backup will not be usable without all the WAL segments.
WARNING: pg_stop_backup still waiting for all required WAL segments to be archived (240 seconds elapsed)
HINT: Check that your archive_command is executing properly. pg_stop_backup can be canceled safely, but the database backup will not be usable without all the WAL segments.
WARNING: pg_stop_backup still waiting for all required WAL segments to be archived (480 seconds elapsed)
HINT: Check that your archive_command is executing properly. pg_stop_backup can be canceled safely, but the database backup will not be usable without all the WAL segments.
WARNING: pg_stop_backup still waiting for all required WAL segments to be archived (960 seconds elapsed)
HINT: Check that your archive_command is executing properly. pg_stop_backup can be canceled safely, but the database backup will not be usable without all the WAL segments.

I've run this for hours on end, and it never finishes. The database is about 11GB.